Displaying Profile Fields in Blog Posts

I want to be able to call certain fields from the authors profile, such as their Twitter name, and display them on a blog post. (i.e. “posted by Phil (@phil) on 9/17/09” where @phil is a link to their twitter profile, which is pulled from the BP profile).

Is there a way to do this?

I’m doing this right now using wpmu fields, but I can’t seem to find out what tag to call in BP to accomplish this.